Take of the best yellow or red _Lapis Calaminaris_ very subtilly powdered, as much as you please, and pour upon it five or six times as much of rectified spirit of salt, mix and stir them well together, and do not leave them long unstirred, but ever and anon shake the glass with the materials; and this do oftentimes, or else the _Lapis Calaminaris_ will grow together into a very hard stone, which can be dissolved no more, and is prevented by the aforesaid often shaking: and when the spirit of salt will dissolve no more thereof in _frigido_, set the glass in warm sand so long, until the spirit be tinged with a most yellow colour, which then decant, and pour on fresh, and again set it in digestion to extract, and do not forget to shake the glass often. The solution being finished filter it, and cast away the residue of the _terra mortua_. Afterwards set the solution in sand, and give fire, and almost three parts of the spirit of salt will go over insipid, which is nothing but the flegme, although the spirit was never so well rectified; the reason whereof is the most dry nature of _lapis calaminaris_, to which the spirit of salt is very friendly, and therefore very hard to be separated from it. For I never knew any mineral or metal (beside _Zinck_) which exceeds _lapis calaminaris_ in dryness. At last when no more flegm will go over, let all things cool; which being done, take out the glass, and thou shalt find a red thick oyl, as fat as oyl olive, and not very corrosive; for that spirit of salt being almost mortified with the _lapis calaminaris_ is deprived of its acidity. This oyl is to be kept from the air; or else within a few dayes it attracts much air which it converts into water, and thereby becomes weakened. This Oyl is of wonderful Vertue, being used as well inwardly as outwardly. And I wonder that in so long a time there hath been no body, who hath operated in _lapis calaminaris_ and described the nature thereof, seeing it hath in it a golden sulphur (of which thing in the fourth Part) for if the terrestreity thereof were separated from it artificially, pure gold would be manifested therein; now the greatest part thereof is volatile, and immature, and cannot easily be reduced into a body in melting, wherefore hitherto that stone hath not been esteemed of by Chymists, but to the wise was alwayes pretious, _&c._ _The use of the Oyl of_ Lapis Calaminaris. If it be given from 1. 2. 3. drops to ten, and fifteen with sutable vehicles, it purgeth the dropsy, leprosy, gout, and other noxious fixed humors not yielding to vegetable Catharticks, of which more at large in the second Part of the spirit of urine and salt of tartar. It serves outwardly for an excellent vulnerary balsome, the like to which can scarce be shewed, not only in reducing old corrupt wounds, but also in those that are green, for it doth powerfully dry, mundify, and consolidate.